fix(cli): stabilize prompt layout to prevent jumping when typing

- Added minHeight and spacer text to shortcuts hint container
- Ensures the line occupied by the hint remains in the layout even when the hint is hidden during typing
- Updated tests and snapshots

packages/cli/src/ui/components/Composer.test.tsx

@@ -820,18 +820,7 @@ describe('Composer', () => {
   });
 
   describe('Shortcuts Hint', () => {
-    it('restores shortcuts hint after 200ms debounce when buffer is empty', async () => {
+    it('hides shortcuts hint when text is typed in buffer', async () => {
-      const { lastFrame } = await renderComposer(
-        createMockUIState({
-          buffer: { text: '' } as unknown as TextBuffer,
-          cleanUiDetailsVisible: false,
-        }),
-      );
-
-      expect(lastFrame({ allowEmpty: true })).toContain('ShortcutsHint');
-    });
-
-    it('does not show shortcuts hint immediately when buffer has text', async () => {
       const uiState = createMockUIState({
         buffer: { text: 'hello' } as unknown as TextBuffer,
         cleanUiDetailsVisible: false,
@@ -901,16 +890,6 @@ describe('Composer', () => {
       expect(lastFrame()).not.toContain('ShortcutsHint');
     });
 
-    it('hides shortcuts hint when text is typed in buffer', async () => {
-      const uiState = createMockUIState({
-        buffer: { text: 'hello' } as unknown as TextBuffer,
-      });
-
-      const { lastFrame } = await renderComposer(uiState);
-
-      expect(lastFrame()).not.toContain('ShortcutsHint');
-    });
-
     it('hides shortcuts hint while loading in minimal mode', async () => {
       const uiState = createMockUIState({
         cleanUiDetailsVisible: false,

packages/cli/src/ui/components/Composer.tsx

@@ -249,8 +249,13 @@ export const Composer = ({ isFocused = true }: { isFocused?: boolean }) => {
             marginTop={isNarrow ? 1 : 0}
             flexDirection="column"
             alignItems={isNarrow ? 'flex-start' : 'flex-end'}
+            minHeight={1}
           >
-            {showUiDetails && showShortcutsHint && <ShortcutsHint />}
+            {showUiDetails && showShortcutsHint ? (
+              <ShortcutsHint />
+            ) : (
+              <Text> </Text>
+            )}
           </Box>
         </Box>
         {showMinimalMetaRow && (
@@ -309,6 +314,7 @@ export const Composer = ({ isFocused = true }: { isFocused?: boolean }) => {
                 marginTop={isNarrow && showMinimalBleedThroughRow ? 1 : 0}
                 flexDirection={isNarrow ? 'column' : 'row'}
                 alignItems={isNarrow ? 'flex-start' : 'flex-end'}
+                minHeight={1}
               >
                 {showMinimalContextBleedThrough && (
                   <ContextUsageDisplay
@@ -317,18 +323,14 @@ export const Composer = ({ isFocused = true }: { isFocused?: boolean }) => {
                     terminalWidth={uiState.terminalWidth}
                   />
                 )}
-                {showShortcutsHint && (
                 <Box
                   marginLeft={
                     showMinimalContextBleedThrough && !isNarrow ? 1 : 0
                   }
-                    marginTop={
+                  marginTop={showMinimalContextBleedThrough && isNarrow ? 1 : 0}
-                      showMinimalContextBleedThrough && isNarrow ? 1 : 0
-                    }
                 >
-                    <ShortcutsHint />
+                  {showShortcutsHint ? <ShortcutsHint /> : <Text> </Text>}
                 </Box>
-                )}
               </Box>
             )}
           </Box>

packages/cli/src/ui/components/__snapshots__/Composer.test.tsx.snap

@@ -10,13 +10,15 @@ Footer
 `;
 
 exports[`Composer > Snapshots > matches snapshot in minimal UI mode 1`] = `
-"                                                                                       ShortcutsHint
+"
+                                                                                       ShortcutsHint
 InputPrompt:   Type your message or @path/to/file
 "
 `;
 
 exports[`Composer > Snapshots > matches snapshot in minimal UI mode while loading 1`] = `
-" LoadingIndicator
+"
+ LoadingIndicator
 InputPrompt:   Type your message or @path/to/file
 "
 `;